What we really, really need to do is find out just how energy. at the point of the big bang turned into matter and, if at all possible, figure out how to reverse the process. Everything we do to get energy at the moment is simply converting one form of matter into another which releases a little energy in the process whether it's converting oil molecules into carbon dioxide and water, Hydrogen into Helium etc. Even the fusion reactions in the sun are extremely rare and inefficient with only a tiny part of the energy of the atoms being released in converting the Hydrogen into Helium. If we could actually convert atoms straight into energy then literally a handful of any old atoms could provide the energy needed to power the whole world.
Think on the fact that something like less than 0.001% of the Hydrogen atoms in the Sun that are forced together form Helium and give off a high energy Photon that then takes an estimated million years or so to work it's way to the surface of the Sun losing a very large part of it's energy in the process before escaping and travelling to Earth as light energy. If a single Photon escaping an atom has the energy to do that imagine the energy that is hidden in one tiny innocuous atom of any given element and then imagine the number of atoms in our bodies alone and the power in matter is truly inconceivable. A teaspoon of sand could destroy the planet if we could figure out the conversion process.